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enantioselective O-to-C rearrangements of O-acylated benzofuranone
derivatives, see ref. 8b. For an early example, see: Black TH.
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15 Crystallographic data have been deposited
with the Cambridge Crystallographic Data Centre, accession number CCDC
771490(4), and are available free of charge
via www.ccdc.cam.ac.uk/data_request/cif.
17
General Procedure
All
the reactions were carried out with no precautions to exclude moisture
in undistilled toluene. In an ordinary vial equipped with a magnetic
stir bar, amine A or B (0.02
mmol, 6.5 mg, 10 mol%) and benzoic acid (0.04 mmol, 4.9
mg, 20 mol%) were dissolved in toluene (1 mL). After stirring
at r.t. for 10 min, the cyclic enones 2 (0.2
mmol) was added, followed by the addition of oxindole 1 or benzofuranone 5 (0.24
mmol, 1.2 equiv). The vial was sealed, and the mixture stirred for
1 d at r.t. The crude mixture was diluted with CH2Cl2 and
flushed through a short plug of silica, using CH2Cl2-EtOAc
(1:1) as the eluent. Solvent was removed in vacuo, and the Michael
adduct 3 or 6 was
purified by flash column chromatography (silica gel, hexane-EtOAc).
All new compounds gave satisfactory spectroscopic and analytical
data. As a typical example, the data of the compound 3a are
given.
(
R
)-
tert
-Butyl 3-Benzyl-2-oxo-3-[(
S
)-3-oxocyclohexyl]-indoline-1-carboxylate
(3a, Entry 1, Table 2)
Isolated as a mixture of diastereomers
(5.2:1 dr) by column chromatography (hexane-acetone = 90:10)
in 80% yield. The ee (96% ee) was determined by
HPLC on a chiral stationary phase [Chiralpak AD-H; hexane-i-PrOH (98:2); 0.50 mL/min; λ = 214,
254 nm; t
R = 34.1
min(major), 41.7 min (minor, based on
the racemic mixture)]; [α]D
rt -17.37
(c 0.98, CHCl3, dr = 5.2:1,
96% ee). ¹H NMR (400 MHz, CDCl3): δ = 1.47-1.64
(m, 2 H), 1.55 (s, 9 H), 1.70-1.81 (m, 1 H), 1.97-2.12
(m, 1 H), 2.15-2.32 (m, 1 H), 2.32-2.50 (m, 2
H), 2.55-2.61 (m, 2 H), [CH2 A-B type
spectrum (3.04, d, 1 H, J
gem = -12.8
Hz), (3.30, d, 1 H, J
gem = -12.8
Hz)], 6.72-6.77 (m, 2 H), 6.93-7.06 (m,
3 H), 7.13-7.31 (m, 3 H), 7.52-7.57 (m, 1 H). ¹³C
NMR (100 MHz, CDCl3): δ = 25.1 (CH2), 26.4
(CH2), 28.3 (3× CH3), 41.4 (CH2),
42.2 (CH2), 43.0 (CH2), 46.2 (CH), 57.4 (C),
84.3 (C), 115.0 (CH), 123.6 (CH), 124.4 (CH), 126.9 (CH), 127.9
(CH), 128.6 (CH), 129.3 (C), 130.0 (CH), 135.1 (C), 140.3 (C), 148.8
(C), 177.2 (C), 210.6 (C). HRMS (EI): m/z calcd
for C26H29NO4: 419.2096; found: 419.2092.